Thread: 'Hello World' of Inheritance (need help)

Hello,
I need to understand the basic syntax of C++ and object oriented design including inheritance. So I'm trying to compile a sort of template to aid my understanding. This code has multiple problems, and I hardly know where to start with all the errors. I was also perplexed when I thought of creating an instance of the most derived object (the truck class) with all the qualities of the base classes; this particular point-of-confusion is that each constructor (as I wrote them) does not set the instance variables for the upper base classes.

Code:

# include <stdio.h>
# include <stdlib.h>


class Automobile{
	protected:	/* protected means only derived classes can use directly */
		int a;
		int b;
	public:
		Automobile(int a_, int b_){
			a = a_;
			b = b_;
		}
};

Class Truck : Automobile{
	protected:
		int c;
		int d;
	public:
		Truck(int c_, int d_){
			c = c_;
			d = d_;
		}
};
	
Class PickUp : Truck{
	private:
		int e;
		int f;
	public:
		PickUp(int e_, int f_){
			e = e_;
			f = f_;
		}
};

PickUp::print(){
	printf("%d %d %d %d %d %d", a,b,c,d,e,f);
}
		
int main(){
	PickUp x(?????);
	//I don't understand how to declare a new PickUp object with a,b,c,d,e,f
	
	x.print();
}

Thanks in advance.